Locking device for compasses, &amp; c.



Patented luly 9, l90L c. u S7 E S S A DI .w s nnC LR Y0 mfr .E Lm... V E D E m K C nu L 3. o, 8 -l .b 0. N

(Apblication` ld Mal'. 7| 1900.)

(lo ludel.)

u. h. c.

UNITED STATES PATENT OFFICE.

LEOPOLD MYERS, OF BIRMINGHABLKENGLAND.

LOCKING VDEVICE FOR COMPASSES, 80C.

SPECIFICATION forming part of Letters Patent No. 678,003, dated July 9, 1901.

Application filed'March 7, 1900. Serial No. 71690. (No model.)

To all whom, it may concern.-

Beit known that I, LEOPOLD MYERS, a subject of the Queen of GreatBritain and Ireland, and a resident of Birmingham, England, have invented certain new and useful Improvements in Locking Devices for Compasses and drawings, forming part of my application, and

in which similar letters of reference indicate similar parts throughout the several views, Figure lis a side elevation of a compass provided with my improved locking device. Fig. 2 is an edge elevation of the same, and Fig. 3 is a sectional view taken on lines 2 2 of Fig. 1.

For simplicitys sake I have shown in the drawings a compass having one metal leg and the other leg consisting of a pencil or other proper marking medium.

A represents the leg of the compass, and B the pencil or the like, secured at the upper end of B in brackets C.

On the disk D and integral therewith is a bulging protuberance or elevation E,substan tially semicircular in shape, which by an engagement with the the thumb-key F causes the compass to be firmly locked or secured.

The part E constitutes an inclined plane have ing its lowest level at the left and its highest at the right. When the compass has been set at the proper angle, the thu nnb-key F, which is pivoted at ce, is turned from left to right until the parts are firmly secured. The disksv D and G and the brackets Care made in one piece, and adjacent to the inner side of the disk G is a washer H. Placed next the outer side of the disk G is a smaller circular disk K, which is secured to the thumb-key F and moves therewith. A

While throughout this specification I have described my invention as being applicable to Compasses, it is understood that I do not confine myself to a looking device for compasses, but that my invention may be used in any connection to which it can be properly applied. v

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

:In combination in a compass, the limb A,

brackets C, C, having disk parts D secured thereto, one of the said parts having an inclined protuberance on the outer side of the disk part and a key passing through all of the said parts and bearing upon the protuberance, substantially as described.

In witness whereof I have hereunto set my hand in presence of two Witnesses.

LEOPOLD MYERS.

Witnesses:

. HUGO Louis BEIL,

OTTO MUNK. 

